How many photos do I need? Vinny November 02, 2021 21:58 Updated The number of photos needed for your photo slideshow depends on the length of your song. Once you visit your slideshow builder, it will provide the exact number of photos needed to fill your slideshow. Related articles Can I make changes to my Photo Slideshow once it's finished? If my song is added to streaming platforms, are they public? Does the CD come with a case? When do I build my Photo Slideshow? Does your Photo Slideshow display the lyrics on the screen?